Odour Threshold Investigation 2012 - Bay of Plenty Regional Council

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7.1.2 Ambient H 2 S levels No H 2 S was detected by the Jerome instrument within the Whakatāne test room. During testing in Rotorua a number of sessions were affected by the ingress of ambient H 2 S into the testing room. Figure 7.2 shows the indoor levels recorded by the Jerome analyser, and the significant ingress experienced on the first day prompted the move to a second location. Because of this contamination, the following data values were removed from the Rotorua H 2 S dataset prior to the main analysis: • 26/3/2012 all data points. • 27/3/2012 12:00 – 16:00. • 30/3/2012 13:00 – 16:30. Figure 7.2 Indoor H 2 S levels during testing in Rotorua. 34 Environmental Publication 2012/06–A review of odour properties of H 2 S Odour Threshold Investigation 2012
The effect of this elevated background level of H 2 S in the testing room can be seen in the following two graphs (Figure 7.3). A desensitising effect can be seen per panellist, with high threshold values being recorded. Figure 7.3 Effect of elevated ambient H 2 S level during testing. 7.2 Panel characteristics The following two sections give some background information about the character of each group. Sex and age are the two main parameters recorded along with the amount of time each Rotorua panellist had lived in Rotorua (Figure 7.4). Details regarding smoking were also noted but all panellists except Panellist #1 were non-smokers. Sex was evenly split for both groups with a slight dominance of females in the Rotorua group. Age spread was also generally common for both groups; the Whakatāne group had a median age of 43, with a minimum of 22 (Panellist #46) and maximum of 60 (Panellist #59). Rotorua had a median age of 42, with a minimum of 21 (Panellist #27) and maximum of 58 (Panellist #8). Environmental Publication 2012/06–A review of odour properties of H 2 S Odour Threshold Investigation 2012 35
Page 1: A review of odour properties of H 2
Page 5: Acknowledgements Dr Bruce Graham fo
Page 8 and 9: In relation to the second question
Page 10 and 11: 6.5 Equipment 29 6.6 Requirements o
Page 12 and 13: Figure 7.10 Graphical summary of th
Page 14 and 15: The standardisation of DDO in Austr
Page 16 and 17: Figure 2.1 Odorant receptors and th
Page 18 and 19: Figure 2.3 Relative slope of odour
Page 21: Part 3: H 2 S health effects The pr
Page 24 and 25: such as composting can provide very
Page 26 and 27: Seigel et al 32 undertook measureme
Page 28 and 29: Rotorua District Council also under
Page 30 and 31: Kevern 56 undertook several surveys
Page 33 and 34: Part 5: H 2 S threshold information
Page 35 and 36: The American Industrial Hygiene Ass
Page 37: Earlier summaries of data in relati
Page 40 and 41: The results generated by the olfact
Page 42 and 43: At each round of the testing proces
Page 44 and 45: 6.7.2 n-Butanol vapour The standard
Page 48 and 49: Residence time for Rotorua panellis
Page 50 and 51: Figure 7.7 Example of incomplete ro
Page 52 and 53: A display of the “round” values
Page 54 and 55: Figure 7.11 Log 10 mean session dat
Page 56 and 57: Panellist means Figure 7.12 t-test
Page 58 and 59: The original concept behind the tes
Page 60 and 61: Figure 7.16 Frequency plots - perce
Page 62 and 63: Figure 7.17 Scatterplot showing n-b
Page 64 and 65: Several types of analysis of the gr
Page 66 and 67: Figure 8.1 Updated H 2 S threshold
Page 69: Appendix 1 - Olfactometer calibrati
Page 73 and 74: Appendix 3 - Dr Ray Littler analysi
Page 75 and 76: Effect of elevated ambient H 2 S On
Page 77 and 78: Figure 4 Untransformed is non-norma
Page 79 and 80: 14 Histogram of MnH2S_Whakatāne 12
Page 81: Histogram of Mn butanol Lognormal R

Odour Threshold Investigation 2012 - Bay of Plenty Regional Council

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